laundry, cleaning, fading, detergent, water

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I've heard that warm water fades clothes, but almost all dark-colored clothes say warm water. I always wash my dark clothes in cold water, but they always seem to fade so quickly even though I use the special laundry dtergent for dark clothes and I am scared to try washing them in warm or hot water because I fear that that will make them fade even faster. So what temperature is really the best for dark laundry? What do u do to keep your clothes from fading? Which detergent do u think is the best for dark laundry?